$20 - 5 \cdot 4$
$\left(\sqrt{2+x}\right)\cdot\left(\sqrt{2-x}\right)$
$\left(x^2-4\right)\frac{dy}{dx}=\frac{1}{y}$
$12x^3-60x^2+75x$
$\frac{3\left(i-1\right)}{5}$
$-8+\left|1\right|$
$y^{2}=2x-2$
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